public void GetRegExTestUkReturnsRegEx()
        {
            var result = PhoneNumberRegEx.GetRegEx(PhoneNumberType.UK);

            result.Should().Be(PhoneNumberRegEx.UkPhoneNumberRegEx);
        }
        public void GetRegExTestIntReturnsRegEx()
        {
            var result = PhoneNumberRegEx.GetRegEx(PhoneNumberType.International);

            result.Should().Be(PhoneNumberRegEx.IntPhoneNumberRegEx);
        }
        public void GetRegExTestUnknownThrows()
        {
            Action act = () => PhoneNumberRegEx.GetRegEx((PhoneNumberType)10);

            act.Should().Throw <ArgumentException>();
        }